r+7=-9-3r

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Solution for r+7=-9-3r equation: 



r+7=-9-3r

We move all terms to the left:

r+7-(-9-3r)=0

We add all the numbers together, and all the variables

r-(-3r-9)+7=0

We get rid of parentheses

r+3r+9+7=0

We add all the numbers together, and all the variables

4r+16=0

We move all terms containing r to the left, all other terms to the right

4r=-16

r=-16/4

r=-4

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